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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div{
          color: red;
            font-size: 20px;
            font-weight: 800;
            /*
            斜体
            */
            font-style: italic;
            /* 
            中划线
            */
            /* text-decoration: line-through; */
            /* 
            上划线
            */
            /* text-decoration: overline; */
            /* 
            下划线
            */
            text-decoration: underline;
        }
    </style>
</head>
<body>
    <div>
        雨停了
    </div>
</body>
</html>